Give your car that classic hot rod idle with Thumpr cams. Early exhaust opening and more overlap create a lopey idle. New lobe designs give great area and air flow for outstanding power. Great mid-range response comes from an early intake closing which traps more air. This camshaft creates minimal engine vacuum so modifications are required for any vacuum accessories such as power brakes. Valve train upgrades are required to support the camshaft's profile. Looser converters, more rear end gear and other performance engine modifications work best with Thumpr cams.

How much horsepower would this add to a 302

Asked by: cole phillips

It's impossible to say without knowing more about your 302. The engine varied widely over the 30 years of production in terms of certain aspects of design and emissions control, so I can't given you any estimate of the power gain.